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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <div id="div0">一个格子</div>
    <div id="div1" class="class1">用例1</div>
    <div id="div2"><a href="#">用例2</a></div>
    <span id="div3" class="class1">用例3</span>
    <div id="div4">用例4</div>
    <ul>
        <li class="class1">第一个</li>
        <li>第二个</li>
        <li>第三个</li>
    </ul>
    <ol>
        <li>第一个</li>
        <li>第二个</li>
        <li>第三个</li>
    </ol>
</body>
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